The hard part is that most things in that space end up being overly favorable to the protagonist: rings of invisibility, magic armor, glowing swords, etc.

What you really want, though, are items that create new value for everyone rather than simply give a new offensive/defensive weapon. There might be a spell or two that could work…

Here are a few to consider:
Dispel Magic
Clarity of Mind
Freedom of Movement
Unbinding
Find the Gap
Find the Path
Discern Lies
Know Opponent
Locate Object
See invisibility
True Seeing
Accelerate Movement
Speak to Allies

That might spur some creative thinking.

Vendors have dominated the channels of communication for so long, even their customers are beginning to believe that it is only right that customers too should speak as promoters with the vendor’s voice on the vendor’s authority and commission.

However, VRM redresses the balance in the relationship. Instead of customers risking their integrity by being persuaded to speak on the vendor’s behalf, customers can now speak on customers’ behalf.

We have vendors and the promoters that they commission, promoters that should now be proud of the authentic voice with which they speak – instead of an unchallenged pretence of speaking on the customers’ behalf.

With VRM we also recognise customers and the more vocal among them, who represent those of a like mind, those blogging ambassadors who should now rightly seek commission from their fellow customers, not from the vendors that inveigle their favour. And so, the champions of customers then speak with a voice authentic of and to customers.

So, vendors and their promoters that they fund, are soon to be in fair market of equals, with customers and their promoters that they fund.

Authentic vendors, authentic customers, all speaking authentically.

Authentic markets are authentic conversations.